BSI The British Standards Institute (BSI)

The British Standards Institute (BSI) set up Kitemark Window Energy Ratings in 2010 in additional to the existing Window Energy Ratings Scheme previously established by the British Fenestration Rating Council (BFRC).

Under either scheme double glazing and triple glazing systems manufacturers and suppliers are able to apply to join if they can fulfil stringent criteria, to ensure that the products they supply and fit confirm to the current Building Regulations, and are given an accurate independent rating.

BSI Kitemark Window Energy Ratings is therefore a third party product certification scheme which results in the certification of the energy rating of a double glazing manufacturers windows. In order for any particular combination of window frame, system, polyamide strip, gaskets and glazed sealed unit to receive an energy rating the manufacturer must a) obtain simulations from a BSI accredited simulator and b) demonstrate their ability to manufacture the windows defined by the simulations by controlling the supply of components and fabrication processes. This is enforced by continuous independent assessment by a BSI assessor every 6 months.

BSI simulations define the potential thermal performance of the window, taking into account the U value of the materials used, the solar gain (g value) and air leakage of the window design.

Hazlemere Window Company Ltd were awarded their BSI Kitemark Licence in 2010 in respect of Window Energy Ratings. Their Kitemark Licence Number is KM 566333 and each Hazlemere Windows customer who have double glazing or triple glazing installed by Hazlemere receive a BSI Certificate for their particular combination of products stating its Window Energy Rating (A, B or C).

Our clients have said...

Hazlemere Commercial

"Quite simply, your costing was the most competitive, your product was the best quality and your service and your workmanship was the best in class"

“I wanted to write formally to thank you both and your team at Hazlemere Window Company for a seamless process of installing new windows into some of our existing buildings at Burnham Grammar School. Your handling of the whole process has been exemplary and the service level at each stage was outstanding. Quite simply, your costing was the most competitive, your product was the best quality and your service and your workmanship was the best in class. I would look to use Hazlemere in projects going forward and would be happy to recommend you to future customers.”

Dr Andrew Gillespie, Headteacher, Burnham Grammar School

Hazlemere Commercial

"Quite simply, your costing was the most competitive, your product was the best quality and your service and your workmanship was the best in class"

“I wanted to write formally to thank you both and your team at Hazlemere Window Company for a seamless process of installing new windows into some of our existing buildings at Burnham Grammar School. Your handling of the whole process has been exemplary and the service level at each stage was outstanding. Quite simply, your costing was the most competitive, your product was the best quality and your service and your workmanship was the best in class. I would look to use Hazlemere in projects going forward and would be happy to recommend you to future customers.”

Dr Andrew Gillespie, Headteacher, Burnham Grammar School

Hazlemere Commercial

"Your team followed all our protocols without question and worked in a safe and appropriate manner at all times"

"As a school, we are very sensitive to the conduct of contractors on our site when our students are also present. Your team followed all our protocols without question and worked in a safe and appropriate manner at all times. We really hope that the windows will dramatically reduce our maintenance costs and also our energy costs, as we are now able to keep heat inside the buildings. Please pass on our thanks to all of your team."

Mrs Grimsdale, The Misbourne School, Great Missenden, Bucks

Hazlemere Commercial

"From estimating to fitting their approach is professional in all respects"

"We have placed several contracts with Hazlemere Windows and we do so in the sure confidence that we shall not be disappointed with the result. From estimating to fitting their approach is professional in all respects and during all installations their security concerns are paramount."

Mrs Labrum, Head, Windsor Girls School, Windsor, Berks

Hazlemere Commercial

"Very professional and accommodating"

"Could you please thank the teams that worked on Harris, Sunley and Hutber Houses at the university recently, the work was completed on time and in a very professional and accommodating manor, we know that we can be a difficult customer to work for but all of your teams were a credit to your company and we will be progressing with more window replacements next year which we will be asking Hazlemere to do as a result of the continued high standards the we receive from you."

Matthew Cross, Maintenance Manager, Buckingham University, Bucks

Hazlemere Commercial

"The head teacher is delighted with what has been achieved"

"Despite all my concerns you have achieved your goal and I know the head teacher is delighted with what has been achieved and the clean state in which her school has been left. You are one of few firms who do so. We do appreciate the commitment shown to the project by Paul and his 'gang'. It must be the benefit of having a tool maker leading the team. Thanks too from me for making me feel that we were working together to achieve this successful result."

Mr Goodway - Crawley Ridge School, Camberley, Surrey

Hazlemere Commercial

"There has been no disruption to the day to day running of the school"

"I am writing to compliment you on the work carried out by the installation team led by Lee Cross in our window replacement programme this year. Throughout the summer and during the last couple of weeks that the team has been on site, there has been no disruption to the day to day running of the school. Lee has kept the school informed at all times of what we should be expecting and it has been a pleasure to work with the team."

Mr J Fletcher, The Beaconsfield School, Beaconsfield, Bucks

Hazlemere Commercial

"Thank you for the excellent transformation of our school"

"Everyone at The Radcliffe School would like to thank you for the excellent transformation of our school and the way your teams conducted themselves during school hours."

"Thanks for the professional manner in which your company carried out the work"

"Please accept our thanks for the professional manner in which your company carried out the work. The whole job went extremely smoothly causing very little inconvenience."

Mr J Armstrong - Assistant Headteacher

Hazlemere Commercial

"They maintained good communication and humour with staff"

"The workmen clearly had experience of working in schools. They maintained good communication and humour with staff, were aware of our children's safety and were flexible when necessary."

Great Linford Combined School, Great Linford, Bucks

Hazlemere Commercial

"And the downs of the project…there haven’t been any!”

"I’d also like to thank Hazlemere and all of their sub-contractors who have done a great job particularly Joe Cross, Hazlemere’s Site Manager who has taken ownership of the project and gone beyond the call of duty ensuring each area is complete on time and any remedial works are carried out swiftly and with no fuss. And the downs of the project…there haven’t been any!”

David Leed, Major Projects Manager, Merton Civic Centre, Morden, London

Hazlemere Commercial

"The refurbishment has been carried out with imagination and flair and I congratulate everyone involved"

"The refurbishment has been carried out with imagination and flair and I congratulate everyone involved - council officers and contractors alike - who have worked tirelessly and to very high standards to give us a Town Hall fit for the demands made on a council in the 21st century"

Counsellor Vicky Howes, Maidenhead Town Council, Maidenhead, Berks

Hazlemere Commercial

"The fitters clearly had a wealth of experience of working in schools, keeping open good lines of communication"

“The replacement of windows and doors ran smoothly. The fitters clearly had a wealth of experience of working in schools, keeping open good lines of communication, were sensitive to needs of staff, had an awareness of children’s safety and were flexible when necessary. The Project Manager in particular checked daily that the school was happy with progress and nothing was too much trouble for him.”